Inventory audit notice: TAPPI Press orders will not be processed from August 21–28 during our fiscal year-end inventory audit. Orders placed during this time will ship starting August 31, in the order received. Normal payment processing also resumes August 31.

Thanks for your patience — this helps us serve our members better.

Search

Use the search bar or filters below to find any TAPPI product or publication.

Showing 4,921–4,930 of 5,008 results (Duration : 0.015 seconds)

Filters

Industry

Topics

Content Type

Publications

Level of Knowledge

Committees

Collections

Journal articles
Magazine articles
Open Access
Energy saving potential of interstage screen fractionation for production of board grade BCTMP, TAPPI Journal August 2023

ABSTRACT: Over the last few decades, the continuing decline in mechanical pulp-based grades has led pulp producers to modify operations and implement measures to reduce production costs in order to stay competitive. In spite of a considerable effort to reduce energy consumption, the latter is still a major portion of production costs in the process of making bleached chemithermomechanical pulp (BCTMP). In this study, we evaluated the impact of interstage screening fractionation (ISSF) and secondary refining strategy for producing BCTMP with the objective of reducing refining energy consumption while maintaining or improving bulk and strength properties. In the first step and to establish a baseline for a mill’s existing configuration, the collected primary refined pulp and reject streams from the ISSF were refined in a high consistency (HC) refiner to target freeness levels. The accepts and refined rejects streams were recombined, and their properties were compared to those of the refined primary pulp. The results showed that, at a given freeness of 400 mL and compared to the control case (without fractionation), the ISSF using an 0.070 in. basket followed by rejects refining could lead to about 25% energy saving in the second stage HC refining. Handsheet properties showed that utilization of ISSF could produce BCTMP with higher bulk and similar average fiber length and tear index. However, a slight reduction in tensile strength was observed. In the second set of trials, the primary refined pulp and the rejects from the ISSF using the 0.070 in. basket were refined by a low-consistency (LC) refiner. The results showed that, at the same freeness of 400 mL and compared to refined primary pulp, the ISSF saved about 26% in net LC refining energy. At a specific edge load (SEL) of 0.4 J/m, the produced pulp had similar bulk and strength properties compared to those of the control sample. A higher SEL of 0.6 J/m in LC refining could further decrease net refining energy consumption; however, it also led to reduction in fiber length, bulk, and strength properties.

Journal articles
Magazine articles
Open Access
A three-dimensional model of fine particle retention during

A three-dimensional model of fine particle retention during percolation through a fiber mat, TAPPI JOURNAL August 2015

Journal articles
Open Access
Development and Application of a Real-Time Recovery Boiler E

Development and Application of a Real-Time Recovery Boiler Expert System, 1991 Engineering Conference Proceedings

Journal articles
Open Access
Recovery of Sulfur from Spent Semichemical Pulping Liquors,

Recovery of Sulfur from Spent Semichemical Pulping Liquors, 1991 Engineering Conference Proceedings

Journal articles
Open Access
Performance of High Vacuum Dewatering Elements in the Formin

Performance of High Vacuum Dewatering Elements in the Forming Section, 1993 Engineering Conference Proceedings

Journal articles
Open Access
Cold Blow Batch Cooking Plus Medium Consistency Oxygen: Heat

Cold Blow Batch Cooking Plus Medium Consistency Oxygen: Heat Exchanger Placement, 1993 Engineering Conference Proceedings

Journal articles
Open Access
Hydrodynamics of the Forming Section: The Origin of Nonunifo

Hydrodynamics of the Forming Section: The Origin of Nonuniform Fiber Orientation, 1994 Engineering Conference Proceedings

Journal articles
Open Access
Machine Vision Applications Using Binary and Grayscale Morph

Machine Vision Applications Using Binary and Grayscale Morphology, 1994 Engineering Conference Proceedings

Journal articles
Open Access
Model to Predict the Precipitation of Burkeite in the Multip

Model to Predict the Precipitation of Burkeite in the Multiple Effect Evaporator and Techniques for Controlling Scaling, 1995 Engineering Conference Proceedings

Journal articles
Open Access
Liquor-To-Liquor Differences in Combustion and Gasification

Liquor-To-Liquor Differences in Combustion and Gasification Processes: Nitrogen Oxide Formation Tendency, 1995 Engineering Conference Proceedings

Inside this Section